package com.atguigu.gulimall.order.service.impl;

import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.utils.R;
import com.atguigu.common.vo.MemberRespVo;
import com.atguigu.gulimall.order.constant.OrderConstant;
import com.atguigu.gulimall.order.dao.OrderItemDao;
import com.atguigu.gulimall.order.entity.OrderItemEntity;
import com.atguigu.gulimall.order.enume.OrderStatusEnum;
import com.atguigu.gulimall.order.feign.CartFeignService;
import com.atguigu.gulimall.order.feign.MemberFeignService;
import com.atguigu.gulimall.order.feign.ProductFeignService;
import com.atguigu.gulimall.order.feign.WmsFeignService;
import com.atguigu.gulimall.order.interceptor.LoginUserInterceptor;
import com.atguigu.gulimall.order.service.OrderItemService;
import com.atguigu.gulimall.order.to.OrderCreateTo;
import com.atguigu.gulimall.order.vo.*;
import com.baomidou.mybatisplus.core.toolkit.IdWorker;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.script.DefaultRedisScript;
import org.springframework.stereotype.Service;

import java.math.BigDecimal;
import java.util.*;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;

import com.atguigu.gulimall.order.dao.OrderDao;
import com.atguigu.gulimall.order.entity.OrderEntity;
import com.atguigu.gulimall.order.service.OrderService;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.StringUtils;
import org.springframework.web.context.request.RequestAttributes;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.servlet.HandlerInterceptor;


@Service("orderService")
public class OrderServiceImpl extends ServiceImpl<OrderDao, OrderEntity> implements OrderService {

    private ThreadLocal<OrderSubmitVo> confirmVoThreadLocal = new ThreadLocal<>();

    @Autowired
    OrderItemService orderItemService;

    @Autowired
    ProductFeignService productFeignService;

    @Autowired
    MemberFeignService memberFeignService;

    @Autowired
    CartFeignService cartFeignService;

    @Autowired
    WmsFeignService wmsFeignService;

    @Autowired
    ThreadPoolExecutor executor;

    @Autowired
    RedisTemplate redisTemplate;

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<OrderEntity> page = this.page(
                new Query<OrderEntity>().getPage(params),
                new QueryWrapper<OrderEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public OrderConfirmVo confirmOrder() throws ExecutionException, InterruptedException {
        OrderConfirmVo confirmVo = new OrderConfirmVo();
        MemberRespVo memberRespVo = LoginUserInterceptor.loginUser.get();
        //获取之前的请求
        RequestAttributes requestAttributes = RequestContextHolder.getRequestAttributes();

        CompletableFuture<Void> getAddressFuture = CompletableFuture.runAsync(() -> {
            //每一个线程请求都共享之前的请求数据
            RequestContextHolder.setRequestAttributes(requestAttributes);
            //1,远程查询所有的收货地址列表
            List<MemberAddressVo> address = memberFeignService.getAddress(memberRespVo.getId());
            confirmVo.setAddress(address);
        }, executor);

        CompletableFuture<Void> cartFuture = CompletableFuture.runAsync(() -> {
            //2,远程查询购物车所有选中的购物项
            RequestContextHolder.setRequestAttributes(requestAttributes);
            List<OrderItemVo> items = cartFeignService.getCurrentUserCartItems();
            confirmVo.setItems(items);
            //feign在远程调用之前要构造请求，调用很多拦截器
        }, executor).thenRunAsync(()->{
            List<OrderItemVo> items = confirmVo.getItems();
            List<Long> collect = items.stream().map(item -> item.getSkuId()).collect(Collectors.toList());

            R hasStock = wmsFeignService.getSkusHasStock(collect);
            List<SkuStockVo> data = hasStock.getData(new TypeReference<List<SkuStockVo>>(){});
            if (data!=null){
                Map<Long, Boolean> map = data.stream().collect(Collectors.toMap(SkuStockVo::getSkuID, SkuStockVo::getHasStock));
                confirmVo.setStocks(map);
            }
        },executor);

        //3,查询用户积分
        Integer integration = memberRespVo.getIntegration();
        confirmVo.setIntegration(integration);
        //4，其它数据自动计算

        //TODO 5，防重令牌
        String token = UUID.randomUUID().toString().replace("-","");
        redisTemplate.opsForValue().set(OrderConstant.USER_ORDER_TOKEN_PREFIX+memberRespVo.getId(),token,30, TimeUnit.MINUTES);
        confirmVo.setOrderToken(token);

        CompletableFuture.allOf(getAddressFuture,cartFuture).get();

        return confirmVo;
    }


    @Transactional
    @Override
    public SubmitOrderResponseVo submitOrder(OrderSubmitVo vo) {
        confirmVoThreadLocal.set(vo);
        MemberRespVo memberRespVo = LoginUserInterceptor.loginUser.get();
        SubmitOrderResponseVo response = new SubmitOrderResponseVo();
        //1,验证令牌[令牌的对比和删除必须保持原子性】
        String script = "if redis.call('get',KEYS[1])==ARGV[1] then return redis.call('del',KEYS[1]) else return 0 end";
        String orderToken = vo.getOrderToken();
        //原子验证令牌和删除令牌
        Long result = (Long) redisTemplate.execute(new DefaultRedisScript<Long>(script, Long.class), Arrays.asList(OrderConstant.USER_ORDER_TOKEN_PREFIX + memberRespVo.getId()),
                orderToken);
        if(result == 0L){
            //令牌校验失败
            response.setCode(1);
            return response;
        }else {
            //令牌校验成功
            //下单，去创建订单，验令牌，验价格，锁库存...
            OrderCreateTo order = createOrder();
            //2验价
            BigDecimal payAmount = order.getOrder().getPayAmount();
            BigDecimal payPrice = vo.getPayPrice();
            if (Math.abs(payPrice.subtract(payAmount).doubleValue()) < 0.01){
                //金额对比
                //3,保存订单
                saveOrder(order);
                //4,库存锁定
                WareSkuLockVo lockVo = new WareSkuLockVo();
                lockVo.setOrderSn(order.getOrder().getOrderSn());

                List<OrderItemVo> locks = order.getOrderItems().stream().map(item -> {
                    OrderItemVo itemVo = new OrderItemVo();
                    itemVo.setSkuId(item.getSkuId());
                    itemVo.setCount(item.getSkuQuantity());
                    itemVo.setTitle(item.getSkuName());

                    return itemVo;
                }).collect(Collectors.toList());
                lockVo.setLocks(locks);
                R r = wmsFeignService.orderLockStock(lockVo);
                if (r.getCode() == 0){
                    //锁成功了
                    response.setOrder(order.getOrder());
                    return response;
                }else {
                    //锁定失败
                    response.setCode(3);
                    return response;
                }
            }else {
                response.setCode(2);
                return response;
            }
        }

//        Object redisToken = redisTemplate.opsForValue().get(OrderConstant.USER_ORDER_TOKEN_PREFIX + memberRespVo.getId());
//
//        if (orderToken!=null && orderToken.equals(redisToken)){
//
//        }
    }

    /**
     * 保存订单数据
     * @param order
     */
    private void saveOrder(OrderCreateTo order) {

        OrderEntity orderEntity = order.getOrder();
        orderEntity.setModifyTime(new Date());

        this.save(orderEntity);

        List<OrderItemEntity> orderItems = order.getOrderItems();
        orderItemService.saveBatch(orderItems);
    }

    private OrderCreateTo createOrder(){
        OrderCreateTo createTo = new OrderCreateTo();
        //1,生成订单号
        String orderSn = IdWorker.getTimeId();
        //创建订单号
        OrderEntity orderEntity = buildOrder(orderSn);

        //2，获取到所有的订单项
        List<OrderItemEntity> itemEntities = buildOrderItems(orderSn);

        //3,计算价格相关
        computePrice(orderEntity,itemEntities);

        createTo.setOrder(orderEntity);
        createTo.setOrderItems(itemEntities);

        return createTo;
    }

    private void computePrice(OrderEntity orderEntity, List<OrderItemEntity> itemEntities) {
         BigDecimal total = new BigDecimal("0.0");

        // 叠加每一个订单项的金额
        BigDecimal coupon = new BigDecimal("0.0");
        BigDecimal integration = new BigDecimal("0.0");
        BigDecimal promotion = new BigDecimal("0.0");
        BigDecimal gift = new BigDecimal("0.0");
        BigDecimal growth = new BigDecimal("0.0");

         //订单的总额，叠加每一个订单项的总额信息
        for (OrderItemEntity entity : itemEntities) {
//            BigDecimal bigDecimal = entity.getSkuPrice().multiply(new BigDecimal(entity.getSkuQuantity().toString()));
            // 优惠券的金额
            coupon = coupon.add(entity.getCouponAmount());
            // 积分优惠的金额
            integration = integration.add(entity.getIntegrationAmount());
            // 打折的金额
            promotion = promotion.add(entity.getPromotionAmount());
            // 购物获取的积分、成长值
            gift = gift.add(new BigDecimal(entity.getGiftIntegration().toString()));
            growth = growth.add(new BigDecimal(entity.getGiftGrowth().toString()));

            BigDecimal realAmount = entity.getRealAmount();
            total = total.add(realAmount);
        }
        //订单价格相关
        orderEntity.setTotalAmount(total);
        //应付总额
        orderEntity.setPayAmount(total.add(orderEntity.getFreightAmount()));

        orderEntity.setPromotionAmount(promotion);
        orderEntity.setIntegrationAmount(integration);
        orderEntity.setCouponAmount(coupon);

        // 设置积分、成长值
        orderEntity.setIntegration(gift.intValue());
        orderEntity.setGrowth(growth.intValue());

        // 设置订单的删除状态
        orderEntity.setDeleteStatus(OrderStatusEnum.CREATE_NEW.getCode());

    }

    private OrderEntity buildOrder(String orderSn) {
        MemberRespVo respVo = LoginUserInterceptor.loginUser.get();
        OrderEntity entity = new OrderEntity();
        entity.setOrderSn(orderSn);
        entity.setMemberId(respVo.getId());

        OrderSubmitVo submitVo = confirmVoThreadLocal.get();
        //获取收货地址信息
        R fare = wmsFeignService.getFare(submitVo.getAttrId());
        FareVo fareResp = fare.getData(new TypeReference<FareVo>() {
        });
        //设置运费信息
        entity.setFreightAmount(fareResp.getFare());
        //设置收货人信息 ...7条
        entity.setReceiverCity(fareResp.getAddress().getCity());

        return entity;
    }

    /**
     * 构建订单项数据
     * @param
     * @return
     */
    private List<OrderItemEntity> buildOrderItems(String orderSn) {
        //最后确定每个购物项的价格
        List<OrderItemVo> currentUserCartItems = cartFeignService.getCurrentUserCartItems();
        List<OrderItemEntity> itemEntities = null;
        if (currentUserCartItems!=null && currentUserCartItems.size()>0){
            currentUserCartItems.stream().map(cartItem -> {
                OrderEntity itemEntity = buildOrderItem(cartItem);
                itemEntity.setOrderSn(orderSn);

                return itemEntity;
            }).collect(Collectors.toList());
            return itemEntities;
        }

        return null;
    }

    /**
     * 构建某一个订单项
     * @param cartItem
     * @return
     */
    private OrderEntity buildOrderItem(OrderItemVo cartItem) {
        OrderItemEntity itemEntity = new OrderItemEntity();
        // 1.订单信息： 订单号
        // 已经在items里设置了

        // 2.商品spu信息
        Long skuId = cartItem.getSkuId();
        R r = productFeignService.getSpuInfoBySkuId(skuId);
        SpuInfoVo data = r.getData(new TypeReference<SpuInfoVo>() {
        });
        itemEntity.setSpuId(data.getId());
        itemEntity.setSpuBrand(data.getBrandId().toString());
        itemEntity.setSpuName(data.getSpuName());
        itemEntity.setCategoryId(data.getCatalogId());

        // 3.商品的sku信息
        itemEntity.setSkuId(cartItem.getSkuId());
        itemEntity.setSkuName(cartItem.getTitle());
        itemEntity.setSkuPic(cartItem.getImage());
        itemEntity.setSkuPrice(cartItem.getPrice());
        // 把一个集合按照指定的字符串进行分割得到一个字符串
        // 属性list生成一个string
        String skuAttr = StringUtils.collectionToDelimitedString(cartItem.getSkuAttr(), ";");
        itemEntity.setSkuAttrsVals(skuAttr);
        itemEntity.setSkuQuantity(cartItem.getCount());

        // 4.积分信息 买的数量越多积分越多 成长值越多
        itemEntity.setGiftGrowth(cartItem.getPrice().intValue());
        itemEntity.setGiftIntegration(cartItem.getPrice().intValue());

        // 5.订单项的价格信息 优惠金额

        //6,订单项的价格信息 总额-各种优惠
        itemEntity.setPromotionAmount(new BigDecimal("0.0")); // 促销打折
        itemEntity.setCouponAmount(new BigDecimal("0.0")); // 优惠券
        itemEntity.setIntegrationAmount(new BigDecimal("0.0")); // 积分
        //当前订单项的实际金额
        BigDecimal orign = itemEntity.getSkuPrice().multiply(new BigDecimal(itemEntity.getSkuQuantity().toString()));
        BigDecimal subtract = orign.subtract(itemEntity.getPromotionAmount()
        .subtract(itemEntity.getCouponAmount())
        .subtract(itemEntity.getIntegrationAmount()));
        itemEntity.setRealAmount(subtract);


        return null;
    }

}